Originally Posted by NismoSER

Ack, I can't remember which one is which and I just dropped my SE-R off at the paint shop where it will be for a month.

I do remember that the green wire coming off of the headlight harness was the ground. To get this right, you'll need a voltmeter to verify which wire does what. It sounds like you did exactly what I did which was to follow the NPM instructions but I think Nissan changed up the wiring colors on the harness for the new Tsuru headlights.

You'll notice the way you have it wired up now that when you have your "low" beams on, the power wire is only getting somewhere around 7 or 8 volts. Since the ground and high beam wires are reversed, its actually grounding through the high beam positive wire, since that is looping through the bulb to the ground wire. This is also why your high beam indicator glows when the low beams are on.

When you switch to the high beams, it takes that ground loop thing out of the equation, with the ground getting the power and the high beam positive acting as the ground..your high beams now look normal. Also, the high beams are getting a full 12 volts.

Best way to figure this out without a voltmeter: Turn on your headlights and switch to high beams. Disconnect 1 of the 3 harness wires until the light goes out. Keep note of that, we'll call wire A (main wire A for the main harness is soldered/connected to headlight A for the headlight harness). Reconnect it so that the light goes back on. Disconnect 1 of the other 2 wires until the light goes out again. Call that wire B (main wire B for main harness is soldered/connected to headlight B for the headlight harness). Now swap the wires. Main wire A from the main harness should go to headlight B, and headlight A will go to main wire B. I really wish I had the colors written down because that would make all of this so much easier. LOL

How you have it (and how I had it....)
headlight side low beam ---> low beam
headlight side high beam ---> ground
headlight side Ground ---> high beam

Just swap those last two around!